Java Mongodb 简明教程

Java & MongoDB - Connecting Database

要连接数据库，你需要指定数据库名称；如果数据库不存在，则 MongoDB 会自动创建它。

To connect database, you need to specify the database name, if the database doesn’t exist then MongoDB creates it automatically.

MongoDatabase database = mongo.getDatabase("myDb");

Example

以下是连接数据库的代码片段：

Following is the code snippet to connect to the database −

import com.mongodb.MongoCredential;
import com.mongodb.client.MongoClient;
import com.mongodb.client.MongoClients;
import com.mongodb.client.MongoDatabase;

public class Tester {
   public static void main(String[] args) {
      // Creating a Mongo client
      MongoClient mongoClient = MongoClients.create("mongodb://localhost:27017");
      MongoDatabase database = mongo.getDatabase("myDb");

      // Creating Credentials
      MongoCredential credential;
      credential = MongoCredential.createCredential("sampleUser", "myDb", "password".toCharArray());

      System.out.println("Credentials ::"+ credential);
   }
}

现在，我们按照以下步骤编译并运行上述程序。

Now, let’s compile and run the above program as shown below.

$javac Tester.java
$java Tester

Output

在执行上述程序时，您将得到以下输出。

On executing, the above program gives you the following output.

Credentials ::MongoCredential{mechanism=null, userName='sampleUser', source='myDb', password=<hidden>, mechanismProperties=<hidden>}